A Classical Trigonometric Identity. Or Not?
Geometry
Level
2
\[\sqrt{1-2\sin x \cos x}+\sqrt{\sin^22x+\cos^22x-\cos^2x} \\ = \\ \left |\sin x-\cos x \right |+\left | \sin x \right | \] Is the above equation a trigonometric identity?
by
Ervin Tronati